Blood filter



FIG. 1 is a front elevational view of a blood filter showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a cross-sectional view taken along line 7--7 of FIG. 3; and

FIG. 8 is a cross-sectional view taken along line 8--8 of FIG. 1. 

The ornamental design for a blood filter, as shown. 